#include <cstdio>

using namespace std;

int main() {
    double a, b, c;
    scanf("%lf%lf%lf", &a, &b, &c);
    if (a + b > c && a + c > b && b + c > a) {
        printf("Perimetro = %.1lf", a + b + c);
    } else {
        printf("Area = %.1lf", (a + b) * c / 2);
    }
    
    return 0;
}
